1KOMMA5 reviews in Australia are mostly positive but not spotless. As at November 2026, 1KOMMA5° Australia holds 4.5 stars from roughly 1,780 Google reviews on its national listing, 4.4 from 753 reviews on Trustpilot and 4.3 from 742 ratings on SolarQuotes. The German-owned group sells solar, batteries and its Heartbeat AI energy manager in Queensland, New South Wales, Victoria, the ACT and South Australia.
Our verdict: 1KOMMA5 is a credible premium option for a solar and battery package, provided you are comfortable with its own-brand hardware and a wholesale electricity plan, and you get the timeline and total price in writing. Its Sydney operation is listed in our directory as 1KOMMA5° New South Wales. This is independent desk research. We did not contact 1KOMMA5 and were not paid by it.
Key facts
- 1KOMMA5° Australia had a Google rating of 4.5 stars from 1,783 reviews on its national listing as at November 2026, while its Glendenning, New South Wales listing showed 4.3 stars from 536 reviews.
- 1KOMMA5° Australia had a Trustpilot TrustScore of 4.4 from 753 reviews as at 12 November 2026, and Trustpilot reported that the company had replied to 73% of its negative reviews.
- 1KOMMA5 entered Australia by buying local installers: Natural Solar in late 2022, Solaray Energy in January 2023, then Kozco Energy Group in Adelaide and Arkana Energy Group on the Gold Coast, according to pv magazine reporting from March 2024.
- 1KOMMA5 Australia advertises a 30-year workmanship guarantee through its 1K5° Care program, a 12-year product warranty on the 1KOMMA5° Battery and a 10-year warranty on its hybrid inverters, as stated on its website in November 2026.
- 1KOMMA5 launched Heartbeat AI in Australia in March 2026 with Amber Electric as its retail partner, and says the software comes at no additional cost for customers with a 1KOMMA5° solar and battery system.
- 1KOMMA5 Australia does not publish system prices on its website as at November 2026; pricing is by quote only.
1KOMMA5 at a glance
The table below summarises what we could confirm about 1KOMMA5° Australia from public sources, checked in November 2026.
| Item | Detail |
|---|---|
| Parent company | 1KOMMA5° GmbH, founded in Germany and based in Hamburg |
| Entered Australia | Late 2022, by acquiring Natural Solar |
| Australian head office | North Sydney, NSW (ABN Lookup shows postcode 2060 for the holding company) |
| Legal entities (ABN Lookup) | 1K5 APAC Holding Pty Ltd, ABN 45 662 726 669 (business name “1KOMMA5”); Arkana Group Pty Ltd, ABN 33 604 703 362 (business name “1KOMMA5 Australia”); Kozco Energy Group Pty Ltd, ABN 26 605 073 943 (business names “1KOMMA5 AU” and “1KOMMA5 South Australia”) |
| States served | QLD, NSW, VIC, ACT and SA (company website) |
| What it sells | Own-brand panels, hybrid inverters and battery; Tesla, Sungrow, Enphase, Trina and AIKO products; EV chargers, air conditioning and heat pump hot water |
| Workmanship warranty | 30 years, as advertised under 1K5° Care |
| Google rating | 4.5 from 1,783 reviews (national listing); 4.3 from 536 reviews (New South Wales listing), November 2026 |
| Trustpilot | 4.4 from 753 reviews, November 2026 |
| SolarQuotes | 4.3 from 742 ratings, November 2026 |
| ProductReview.com.au | We did not find a listing |
| Accreditation as stated by the company | Displays New Energy Tech Approved Seller, Solar Accreditation Australia and Tesla Powerwall Certified Installer logos |
The entity on your contract is the one legally responsible for your warranty, so ask for its name and ABN before paying a deposit. Our directory page for 1KOMMA5° New South Wales carries the Sydney listing.
Is 1KOMMA5 any good?
Yes, on the public evidence 1KOMMA5 is a legitimate, well-reviewed installer, with a clear weak spot in communication when jobs go off schedule. Three platforms put it between 4.3 and 4.5 stars across several hundred reviews each, a deeper evidence base than most Australian installers have.
The strengths are an integrated product range, a very long advertised workmanship guarantee and a parent with real scale. The company says it has more than 80,000 systems across Australia.
The weaknesses are just as consistent. Negative reviews on Trustpilot and SolarQuotes cluster around delays, unreturned calls and slow post-install fixes. The model also leans toward 1KOMMA5 hardware and a wholesale tariff through Amber Electric, which does not suit every household.
A rating in the mid fours is common in this industry, so read the reviews under the number. Our analysis of why a high star rating alone means little explains how.
What customers praise
Positive 1KOMMA5 reviews most often mention helpful sales staff and tidy, punctual installation crews. These themes recur on Trustpilot and SolarQuotes in reviews dated August to November 2026.
- Sales advice. Reviewers describe consultants who explained options without pressure.
- Installation day. Crews are often described as on time, polite and careful with clean-up.
- Progress updates. Satisfied customers say they were kept informed through to commissioning.
- System quality. On SolarQuotes, 1KOMMA5 scores 4.5 out of 5 for quality of system, against 4.3 for installation and 4.2 each for value and customer service.
Common 1KOMMA5 complaints
The most common 1KOMMA5 complaints are about communication and delays, not about the hardware. These patterns come from one-star and two-star Trustpilot reviews dated July 2025 to November 2026 and critical reviews on SolarQuotes.
- Slow or missing communication. The largest group describes unreturned calls and emails.
- Timeline slippage. Reviewers report rescheduled install dates and waits for grid connection and rebate paperwork.
- Quote and design disputes. Some felt the proposed system was larger than they needed, or say the price changed after the first quote.
- Installation defects. A smaller group reports equipment placed somewhere other than agreed, incomplete work or minor property damage. Some SolarQuotes reviewers attribute this to subcontracted crews.
- After-sales support. Several describe slow troubleshooting or replacement of a faulty battery or inverter.
- Deposits and payments. A few describe disputes over deposits after cancelling.
These are customer accounts and we have not verified them. 1KOMMA5 does engage publicly: Trustpilot reported in November 2026 that the company had replied to 73% of negative reviews, typically within 48 hours.
Products and brands 1KOMMA5 installs
1KOMMA5 Australia leads with its own-brand hardware and also sells a short list of third-party brands. The product details below are from the company’s website, checked in November 2026.
| Product type | 1KOMMA5 own brand | Other brands listed |
|---|---|---|
| Solar panels | 1KOMMA5° Full-Black double glass TOPCon panel, up to 450 W, 30-year product and performance warranty | Trina Vertex S+, Canadian Solar HiKu, AIKO, TW Solar, Volt solar tiles |
| Inverters | 1KOMMA5° single-phase and three-phase hybrid inverters, 5 kW to 15 kW, 10-year warranty | Sungrow, Enphase IQ microinverters |
| Batteries | 1KOMMA5° Battery, LFP, modular from 9.3 kWh to 41.9 kWh, 12-year product warranty | Tesla Powerwall 3, Sungrow high-voltage LFP, Enphase IQ Battery |
We have reviewed the Tesla Powerwall 3, Sungrow SBR battery, Enphase IQ Battery 5P, Trina Vertex S+ and AIKO Neostar. We have not reviewed the 1KOMMA5° Battery, and its Australian product page does not name the manufacturer.
What is 1KOMMA5 Heartbeat AI?
1KOMMA5 Heartbeat AI is energy management software that decides when a home battery charges, discharges or exports, using wholesale electricity prices and weather forecasts. 1KOMMA5 launched it in Australia in March 2026.
RenewEconomy reported at the launch that Heartbeat AI connects homes to the wholesale market through retail partner Amber Electric. A Heartbeat household therefore moves to wholesale pricing, where rates change through the day and Amber’s own fees apply. Our Amber Electric review covers who that suits.
The company claims Heartbeat AI can improve battery payback by up to $1,500 a year compared with a traditional retail plan. Treat that as a best case. In a July 2026 press release, 1KOMMA5 said a small group of early users saved an average of $28 a month after fees against their previous plans.
1KOMMA5 prices
1KOMMA5 Australia does not publish prices. Its website, checked in November 2026, shows a “request pricing” form for every product, including its New Energy Bundle.
The only public price evidence we found is self-reported. Price bands selected by 1KOMMA5 reviewers on SolarQuotes between early 2025 and September 2026 ranged from $4,000 to $6,000 for some 6 kW-class systems up to more than $20,000 for large systems. The bands do not say whether a battery was included, so they are a rough guide only.
In November 2026 the company’s site advertised a $1,000 gift card with an eligible system purchase. A gift card is not a discount on the contract price, so compare quotes on installed cost after the federal battery discount, which steps down on 1 January 2027. Our guide to comparing solar quotes shows how to line up offers item by item.
Warranty and after-sales support
1KOMMA5 advertises a 30-year workmanship guarantee covering installation-related defects, under a program it calls 1K5° Care. The company’s website says this applies whether or not the system uses 1KOMMA5 products.
A second tier, 1K5° Life, is a paid subscription tied to Heartbeat AI and 1KOMMA5-branded hardware, described as performance cover for life subject to terms and conditions. Its fee is not published on the page we checked.
If an installer stops trading, product warranties stay with the manufacturer, but a workmanship guarantee generally ends with the business. With own-brand hardware, the installer and the product warrantor belong to the same group, which concentrates that risk. Our tracker of Australian solar company failures explains what customers are left with when a retailer closes.
Company background
1KOMMA5 is a German energy company whose name means 1.5 degrees, a reference to the Paris Agreement target. It grew in Australia through acquisitions, and its website now says it is the combination of Arkana Energy Group, Solaray Energy and Kozco Energy Group.
1KOMMA5 and Natural Solar
Natural Solar was the first Australian company 1KOMMA5 bought, in late 2022. A Federal Court judgment published in May 2025 records that a share purchase agreement for Natural Solar was signed on 30 September 2022, with 1K5 APAC Holding Pty Ltd as the Australian holding company.
As at November 2026 Natural Solar still trades under its own name, website and ABN (79 160 373 688), and 1KOMMA5 Australia’s “who we are” page does not mention it. We could not confirm how the two businesses are related today, so treat them as separate retailers.
That judgment, Williams v Natural Solar Pty Ltd [2025] FCA 527, was an interlocutory decision in an employment dispute between Natural Solar and its founder. It made no final findings and did not concern customers or installations.
1KOMMA5 Adelaide
1KOMMA5 in Adelaide is the former Kozco Energy Group, based at Croydon Park. ABN Lookup shows Kozco Energy Group Pty Ltd has held an ABN since March 2015 and registered the business name “1KOMMA5 South Australia” in February 2025.
Regulator action
We found no public enforcement action by a consumer or energy regulator against 1KOMMA5 Australia as at November 2026.
1KOMMA5 vs alternatives
The table below compares 1KOMMA5 with three installers that compete for similar customers, using Google ratings from Google Maps and our directory in November 2026.
| Company | Google rating (November 2026) | Workmanship warranty | Main brands | Best for |
|---|---|---|---|---|
| 1KOMMA5° Australia | 4.5 from 1,783 reviews (national listing) | 30 years (advertised) | 1KOMMA5°, Tesla, Sungrow, Enphase | Integrated solar, battery and wholesale optimisation |
| Natural Solar | 4.7 from roughly 790 reviews | Check your quote | Tesla, Enphase | Tesla Powerwall buyers |
| Platinum Solar Group | 4.9 from roughly 390 reviews | Check your quote | Sigenergy, Tesla, Sungrow and others | Sydney buyers who want brand choice |
| MLEC Solar | 4.9 from roughly 1,240 reviews (listing in our directory) | 20 years (advertised) | Tesla, AlphaESS, Growatt | Battery buyers in Adelaide |
For more local options, see our guides to the best solar companies in Sydney and the best solar companies in Adelaide.
Who 1KOMMA5 suits, and who should look elsewhere
1KOMMA5 suits households that want one company to supply the panels, battery and software, are comfortable with electricity prices that change through the day, and value a long advertised workmanship guarantee.
Look elsewhere if you want the lowest price for a simple solar-only system, prefer a fixed-rate electricity plan, or want a wide choice of battery and inverter brands. 1KOMMA5 does not operate in Western Australia, Tasmania or the Northern Territory.
Questions to ask 1KOMMA5 before you sign
- Which legal entity and ABN will be on my contract, and who backs the 30-year workmanship guarantee?
- Will 1KOMMA5 employees or subcontractors install my system, and who signs off the work?
- What is the installation date, and what happens to my deposit if that date slips?
- Can the price change after the site inspection, and by how much?
- Does Heartbeat AI require me to switch to Amber Electric, what are the monthly fees, and can I leave without losing warranty cover?
- Who manufactures the 1KOMMA5° Battery, and who handles a warranty claim in year 11?
- What does 1K5° Life cost each month, and what does it add to 1K5° Care?
Our guide to choosing a solar installer has a longer checklist.
FAQ
Is 1KOMMA5 legit?
Yes, 1KOMMA5 is a legitimate company. Its Australian business operates through registered companies shown on ABN Lookup, including 1K5 APAC Holding Pty Ltd (ABN 45 662 726 669), and it held 4.5 stars from 1,783 Google reviews as at November 2026.
Who owns 1KOMMA5 Australia?
1KOMMA5 Australia is owned by 1KOMMA5° GmbH, an energy company founded in Germany and based in Hamburg. The Australian business was built by acquiring local installers from late 2022, including Solaray Energy, Kozco Energy Group and Arkana Energy Group.
Is 1KOMMA5 CEC approved?
1KOMMA5 displays the New Energy Tech Approved Seller and Solar Accreditation Australia logos on its website. Solar Cobber does not verify accreditation. Check the approved seller list for the New Energy Tech Consumer Code and the Solar Accreditation Australia installer register yourself, using the entity name on your quote.
How much does 1KOMMA5 charge?
1KOMMA5 does not publish prices in Australia as at November 2026, so the only way to get a figure is a quote. Self-reported price bands on SolarQuotes range from $4,000 to $6,000 for some smaller systems to more than $20,000 for large ones.
What are the most common 1KOMMA5 complaints?
The most common 1KOMMA5 complaints on Trustpilot and SolarQuotes are poor communication, installation delays and slow after-sales support. A smaller number describe quote disputes, installation defects and disagreements over deposits.
Is 1KOMMA5 the same as Natural Solar?
No, 1KOMMA5 and Natural Solar trade as separate brands. 1KOMMA5 acquired Natural Solar in late 2022, but as at November 2026 Natural Solar operates under its own name and ABN, and we could not confirm the current ownership link.
What happens to my warranty if 1KOMMA5 closes?
If an installer closes, its workmanship guarantee usually ends, while product warranties stay with the manufacturer. For 1KOMMA5-branded hardware, ask which entity provides the product warranty and whether it has an Australian office.
Sources
- 1KOMMA5° Australia: home page, who we are, 1K5° Care and Life, battery, Heartbeat AI and launch press release, checked November 2026
- ABN Lookup, searched November 2026
- Trustpilot: 1KOMMA5° Australia and SolarQuotes: 1KOMMA5 reviews, read November 2026
- pv magazine on the Arkana Energy acquisition, March 2024
- RenewEconomy on the Heartbeat AI launch
- 1KOMMA5 press release on early Heartbeat AI results, July 2026
- Federal Court of Australia: Williams v Natural Solar Pty Ltd [2025] FCA 527
- Natural Solar: about us, checked November 2026
- Google Maps listings and the Solar Cobber directory, read November 2026
About this review
This review was written by the Solar Cobber editorial team from independent desk research, checked in November 2026. Solar Cobber is a free directory that may earn referral or advertising fees from installers. Commercial relationships never affect our content. Nothing here is financial advice. If something is wrong or out of date, tell us through our contact page.
Filed under Solar Installers
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